US5160553A - Cold-worked steel of high compressive strength and articles made thereof - Google Patents
Cold-worked steel of high compressive strength and articles made thereof Download PDFInfo
- Publication number
- US5160553A US5160553A US07/601,676 US60167690A US5160553A US 5160553 A US5160553 A US 5160553A US 60167690 A US60167690 A US 60167690A US 5160553 A US5160553 A US 5160553A
- Authority
- US
- United States
- Prior art keywords
- contents
- cold
- steel
- compressive strength
- high compressive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 40
- 239000010959 steel Substances 0.000 title claims abstract description 40
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract 10
- 238000011109 contamination Methods 0.000 claims abstract 5
- 229910052742 iron Inorganic materials 0.000 claims abstract 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- 238000005229 chemical vapour deposition Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 7
- 239000011651 chromium Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- 239000000956 alloy Substances 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 9
- 239000010955 niobium Substances 0.000 description 7
- 229910052804 chromium Inorganic materials 0.000 description 5
- 150000001247 metal acetylides Chemical class 0.000 description 4
- 229910052758 niobium Inorganic materials 0.000 description 4
- 238000005496 tempering Methods 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- UNASZPQZIFZUSI-UHFFFAOYSA-N methylidyneniobium Chemical compound [Nb]#C UNASZPQZIFZUSI-UHFFFAOYSA-N 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- -1 niobium carbides Chemical class 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
Definitions
- the invention concerns a cold-worked steel with high compressive strength and the use of such steel for parts and tools.
- Tools and machine parts are made from cold-worked steels where such steels are used for processing materials at temperatures less than 250° C., especially at room temperature.
- Such processing may be cutting or non-cutting, e.g., stamping, pressing or extruding, the parts or tools being simultaneously subjected to various stresses.
- the desired properties of the parts such as compressive strength, hardness, toughness, wear resistance, cutting life and possibly erosion matching the predominant stresses, shall be achieved by a suitable selection of the composition of the cold-worked steel.
- alloys with about 5% or about 8% Cr and a carbon content of about 1.0% or about 0.5% with additions of Mo, W and V illustratively steels according to DIN material No. 1.2363 or No. 1.2345 or AISI type A2.
- these steels may have good toughness and adequate erosion and abrasion behavior, but their wear resistance and compressive strength are not satisfactory for some applications.
- alloy variations namely those with Cr contents of 10 to 17% and those with 5 to 8% Cr, also incur the drawback that upon additional surface hardening by nitridation and/or carbonitridation, or upon surface coating using the CVD or PVD methods at temperatures between 350° and 600° C., the previously achieved improved hardening of the base material shall be reduced.
- the object of the invention is to synergistically exploit the effects of the alloy elements in a specific range of concentration and to create a cold-worked steel of high compressive strength having high hardness, toughness, wear-resistance and erodibility, cutting, stamping and the like tools made from this steel offering good grindability, cutting and wear lives, and which, in the event of surface hardening and/or surface coating carried out at higher temperatures, shall remain substantially adversely unaffected as regards the previously achieved improved mechanical properties of the base material.
- both the carbon and the nitrogen contents and the elements forming carbides and/or nitrides shall be matched in their concentrations to the carbon and nitrogen affinities and to their tendency to form carbides and/or nitrides.
- these ferrite-forming elements do significantly improve the heat-treatment behavior of the steel and its tempering resistance within the claimed ranges of concentrations. Furthermore nitrides are formed at the corresponding nitrogen content of the alloy and they prevent grain growth during hardening or austenization at high temperatures. When surface hardening by nitridization or carbo-nitridization and/or surface-coating by a CVD or PVD method, or the like, aluminum and silicon are advantageously effective. Niobium is strongly carbide-forming, and even finely precipitated niobium carbides will be only slightly soluble at high austenization temperatures.
- niobium carbide grains which are too coarse, and therefore niobium is added to the alloy only up to a maximum concentration of 0.5%.
- the cold-worked steel of the invention has a minimum admissible specific pressure load of 3022N/mm 2 , a tempering hardness of 63.5 HRC and a toughness which is improved by 28% relative to material No. 1.2379.
- the male and female stamp parts made from steel A had a hardness of 63 HRC and 64,629 stampings could be carried out. In spite of an only slightly lower hardness of 62 HRC of the steel D, it could perform only 20,751 stampings, so that the tool of the invention increased performance by about 300%.
- the surface of the steel B tool was enriched with nitrogen in bath nitridization at about 570° C., and thereupon the hardness of the base material was 63.5 HRC.
- This tool performed 407,320 pressing operations without excessive wear appearing, whereas the steel D tool had to be scrapped after 239,865 pressing operations.
- Cold dies for extruding seamless tubing or pipes of Cr--Ni steel were made from steel D, also from steel C with a composition in % by weight of:
Abstract
The invention concerns a cold-worked steel of high compressive strength for tools and parts simultaneously subjected to several stresses.
The steel of the invention evinces a composition in % by weight of
C: 0.6 to 1.5
Si: 0.2 to 1.6
Mn: 0.2 to 1.2
Cr: 5.0 to 10.0
Mo: up to 3.0
W: up to 6.0
(Mo+2W): 1.0 to 3.0
V: 0.3 to 1.5
Al: 0.2 to 1.6
Nb: up to 0.5
N: up to 0.1
the remainder being iron and process-entailed contaminations, and it is especially provided for tools and parts comprising an anti-wear layer made at higher temperature.
Description
The invention concerns a cold-worked steel with high compressive strength and the use of such steel for parts and tools.
Tools and machine parts are made from cold-worked steels where such steels are used for processing materials at temperatures less than 250° C., especially at room temperature. Such processing may be cutting or non-cutting, e.g., stamping, pressing or extruding, the parts or tools being simultaneously subjected to various stresses. As a rule the desired properties of the parts, such as compressive strength, hardness, toughness, wear resistance, cutting life and possibly erosion matching the predominant stresses, shall be achieved by a suitable selection of the composition of the cold-worked steel.
It is known to meet the requirement, for instance, of high wear-resistance to make use of Cr steels with contents of 1.5 to 2.5% C and 10 to 17% Cr, illustratively steels corresponding to DIN material No. 1.2379 or AISI type D7. While such steels in fact do have high wear resistance, on account of their high and coarse carbide proportion, which most of the time is arrayed in lines, its toughness is low, and accordingly the part may fracture or crack when subjected to bending or shearing stresses.
To make cold-worked steel tools of good toughness, it is known to use alloys with about 5% or about 8% Cr and a carbon content of about 1.0% or about 0.5% with additions of Mo, W and V, illustratively steels according to DIN material No. 1.2363 or No. 1.2345 or AISI type A2. In the event of advantageous alloy structure or carbide structure, these steels may have good toughness and adequate erosion and abrasion behavior, but their wear resistance and compressive strength are not satisfactory for some applications. Moreover the alloy variations, namely those with Cr contents of 10 to 17% and those with 5 to 8% Cr, also incur the drawback that upon additional surface hardening by nitridation and/or carbonitridation, or upon surface coating using the CVD or PVD methods at temperatures between 350° and 600° C., the previously achieved improved hardening of the base material shall be reduced.
The object of the invention is to synergistically exploit the effects of the alloy elements in a specific range of concentration and to create a cold-worked steel of high compressive strength having high hardness, toughness, wear-resistance and erodibility, cutting, stamping and the like tools made from this steel offering good grindability, cutting and wear lives, and which, in the event of surface hardening and/or surface coating carried out at higher temperatures, shall remain substantially adversely unaffected as regards the previously achieved improved mechanical properties of the base material.
This problem is solved by the invention as disclosed in the following detailed description and the appended claims.
It is important with respect to the steel of the invention that both the carbon and the nitrogen contents and the elements forming carbides and/or nitrides shall be matched in their concentrations to the carbon and nitrogen affinities and to their tendency to form carbides and/or nitrides.
Excessive contents of C>1.5% entail proportionately large and also coarse carbide grains and thereby poor material toughness, whereas at contents of less than 0.6% the required mechanical properties, in particular hardness, are not achieved. Chromium, molybdenum, tungsten and vanadium are used as added alloying elements when forming carbides, and according to the invention, the particular concentration of these elements accounts for the interaction. It is important in this respect that during heat treatment those carbides shall dissolve which when being tempered at temperatures>500° C. shall precipitate sub-microscopically, cause high hardening, i.e. a secondary rise in hardening and extensive tempering resistance of the steel. Aluminum and silicon are elements which strongly confine the alloy γ domain and are required on several grounds. Surprisingly, these ferrite-forming elements do significantly improve the heat-treatment behavior of the steel and its tempering resistance within the claimed ranges of concentrations. Furthermore nitrides are formed at the corresponding nitrogen content of the alloy and they prevent grain growth during hardening or austenization at high temperatures. When surface hardening by nitridization or carbo-nitridization and/or surface-coating by a CVD or PVD method, or the like, aluminum and silicon are advantageously effective. Niobium is strongly carbide-forming, and even finely precipitated niobium carbides will be only slightly soluble at high austenization temperatures.
However high niobium contents at the carbon concentrations of cold-worked steels result in niobium carbide grains which are too coarse, and therefore niobium is added to the alloy only up to a maximum concentration of 0.5%.
It was found in comparison tests that the steels of DIN materials No. 1.2363 and No. 1.2379 have an admissible specific pressure load of 2785 and 3026N/mm2 respectively and a 550° C. tempering hardness of 56 and 60 HRC. The cold-worked steel of the invention has a minimum admissible specific pressure load of 3022N/mm2, a tempering hardness of 63.5 HRC and a toughness which is improved by 28% relative to material No. 1.2379.
The invention is elucidated below in relation to illustrative examples of implementation.
Similar stamping tools for making valve disks from 17% Cr steel with a strength of 624N/mm2 and 1 mm thick were made from a steel A of the invention with the following composition in % by weight:
C=0.89
Si=0.98
Mn=0.43
Cr=8.96
Mo=1.82
V=0.38
Al=1.33
Nb=0.04
N=0.028
and an alloy D per material No. 1.2379 with the following composition:
C=1.53
Si=0.32
Mn=0.31
Cr=11.15
Mo=0.64
V=0.92
The male and female stamp parts made from steel A had a hardness of 63 HRC and 64,629 stampings could be carried out. In spite of an only slightly lower hardness of 62 HRC of the steel D, it could perform only 20,751 stampings, so that the tool of the invention increased performance by about 300%.
A steel B with the composition in % by weight as follows:
C=1.09
Si=0.94
Mn=0.36
Cr=8.24
Mo=2.14
W=0.23
V=0.54
Al=1.06
Nb=0.08
N=0.043
and an alloy D as in the previous Example were used for extrusion tools to press aluminum video heads. The surface of the steel B tool was enriched with nitrogen in bath nitridization at about 570° C., and thereupon the hardness of the base material was 63.5 HRC.
This tool performed 407,320 pressing operations without excessive wear appearing, whereas the steel D tool had to be scrapped after 239,865 pressing operations.
Cold dies for extruding seamless tubing or pipes of Cr--Ni steel were made from steel D, also from steel C with a composition in % by weight of:
C=1.22
Si=0.81
Mn=0.38
Cr=7.63
Mo=2.57
V=1.08
Al=0.47
Nb=0.15
N=0.021
and from a steel G (material No. 1.2363) with composition in % by weight of:
C=0.96
Si=0.34
Mn=0.56
Cr=5.06
Mo=0.93
V=0.18
The following lengths in meter of finished tubing or pipe could be made, i.e. extruded:
steel D=6,120
steel C=12,764 and
steel G=5,087.
Claims (7)
1. An article made from a cold-worked steel with high compressive strength greater than 3022 N/mm2, which has its contents consisting essentially, in % by weight, of the following elements:
C: 0.6 to 1.5
Si: 0.2 to 1.6
Mn: 0.2 to 1.2
Cr: 5.0 to 10.0
Mo: up to 3.0
W: up to 6.0
(Mo+2W): 1.0 to 3.0
V: 0.3 to 1.5
Al: 0.2 to 1.6
Nb: 0.02 to 0.35
N: 0.01 to 0.06
and the remainder of the contents being iron and process-entailed contaminations, and in addition said article has an outer surface anti-wear layer made at a high temperature no greater than 600° C.
2. An article as defined in claim 1, wherein said outer surface anti-wear layer holds higher nitrogen and/or carbon contents and is deposited by one of nitridation, carbonitridation or carburization at temperatures between 350° C. and 570° C.
3. An article as defined in claim 1, wherein said layer is a hard layer and is deposited by one of CVD method or PVD method at temperatures less than 570° C.
4. An article as defined in claim 1, which is a stamping tool.
5. A cold-worked steel with high compressive strength greater than 3022 N/mm2, the contents of which consisting essentially, in % by weight, of the following elements:
C: 0.6 to 1.5
Si: 0.2 to 1.6
Mn: 0.2 to 1.2
Cr: 5.0 to 10.0
Mo: up to 3.0
W: up to 6.0
(Mo+2W): 1.0 to 3.0
V: 0.3 to 1.5
Al: 0.2 to 1.6
Nb: 0.02 to 0.35
N: 0.01 to 0.06
and the remainder of the contents being iron and process-entailed contaminations.
6. A cold-worked steel with high compressive strength greater than 3022 N/mm2, the contents of which consisting essentially, in % by weight, of the following elements:
C: 0.8 to 1.3
Si: 0.7 to 1.4
Mn: 0.3 to 1.2
Cr: 6.0 to 9.0
Mo: up to 3.0
W: up to 3.0
(Mo+2W): 1.0 to 3.0
V: 0.5 to 1.3
Al: 0.4 to 1.4
Nb: 0.04 to 0.3
N: 0.015 to 0.04
and the remainder of the contents being iron and process-entailed contaminations.
7. A cold-worked steel with high compressive strength greater than 3022 N/mm2, the contents of which consisting essentially, in % by weight, of the following elements:
C: 0.9 to 1.2
Si: 0.8 to 1.2
Mn: 0.3 to 1.0
Cr: 7.0 to 9.0
Mo: up to 2.5
W: up to 5.0
(Mo+2W): 1.5 to 2.5
V: 0.6 to 1.2
Al: 0.5 to 1.3
Nb: 0.06 to 0.2
N: 0.02 to 0.035
and the remainder of the contents being iron and process-entailed contaminations.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT2423/89A AT393387B (en) | 1989-10-23 | 1989-10-23 | COLD WORK STEEL WITH HIGH PRESSURE STRENGTH AND USE OF THIS STEEL |
| AT2423/89 | 1989-10-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US5160553A true US5160553A (en) | 1992-11-03 |
Family
ID=3534087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US07/601,676 Expired - Lifetime US5160553A (en) | 1989-10-23 | 1990-10-23 | Cold-worked steel of high compressive strength and articles made thereof |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US5160553A (en) |
| EP (1) | EP0425471B1 (en) |
| JP (1) | JP2794641B2 (en) |
| KR (1) | KR0170386B1 (en) |
| AT (1) | AT393387B (en) |
| AU (1) | AU631690B2 (en) |
| BR (1) | BR9005350A (en) |
| DE (1) | DE59008009D1 (en) |
| DK (1) | DK0425471T3 (en) |
| ES (1) | ES2068379T3 (en) |
| TW (1) | TW199910B (en) |
| ZA (1) | ZA908467B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5445685A (en) * | 1993-05-17 | 1995-08-29 | The Regents Of The University Of California | Transformation process for production of ultrahigh carbon steels and new alloys |
| WO1999050469A1 (en) * | 1998-03-27 | 1999-10-07 | Uddeholm Tooling Aktiebolag | Cold work steel |
| US6272963B1 (en) * | 1999-01-28 | 2001-08-14 | Hitachi Metals, Ltd. | Blade material for metallic band saw and metallic band saw made therefrom |
| US6461448B1 (en) | 1998-08-12 | 2002-10-08 | Swagelok Company | Low temperature case hardening processes |
| US20030068248A1 (en) * | 2001-04-11 | 2003-04-10 | Bohler Edelstahl Gmbh | Cold work steel alloy for the manufacture of parts by powder metallurgy |
| US20030155045A1 (en) * | 2002-02-05 | 2003-08-21 | Williams Peter C. | Lubricated low temperature carburized stainless steel parts |
| US6723182B1 (en) * | 2002-11-14 | 2004-04-20 | Arthur J. Bahmiller | Martensitic alloy steels having intermetallic compounds and precipitates as a substitute for cobalt |
| WO2008066438A1 (en) * | 2006-11-27 | 2008-06-05 | E2 Forestry Hb | Wear resistant tool for wood chipping |
| US20100192476A1 (en) * | 2009-01-14 | 2010-08-05 | Boehler Edelstahl Gmbh & Co Kg | Wear-resistant material |
| CN105526437A (en) * | 2016-02-15 | 2016-04-27 | 海安欣凯富机械科技有限公司 | Metal hose |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2280865A (en) * | 1993-08-13 | 1995-02-15 | Mono Pumps Ltd | Flexible drive shaft |
| AT403058B (en) * | 1995-03-23 | 1997-11-25 | Boehler Edelstahl | IRON BASED ALLOY FOR USE AT HIGHER TEMPERATURE AND TOOLS MADE OF THIS ALLOY |
| FR2759092B1 (en) * | 1997-02-04 | 1999-04-16 | Thyssen France Sa | STEEL FOR COLD FORMING |
| JP3284092B2 (en) * | 1997-12-05 | 2002-05-20 | 理研ダイヤモンド工業株式会社 | Cutting and crushing cutter |
| AT407648B (en) * | 1999-05-10 | 2001-05-25 | Boehler Edelstahl | METALLIC MATERIAL WITH HIGH HARDNESS, HIGH WEAR RESISTANCE AND HIGH TOUGHNESS |
| AT500728B8 (en) | 2005-02-21 | 2007-02-15 | Boehler Edelstahl | CUTTING TOOL |
| AT508591B1 (en) * | 2009-03-12 | 2011-04-15 | Boehler Edelstahl Gmbh & Co Kg | COLD WORK STEEL OBJECT |
| KR101599721B1 (en) | 2014-02-27 | 2016-03-04 | 김종선 | Electricity ondol pannel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4264380A (en) * | 1979-11-16 | 1981-04-28 | General Electric Company | Nitride casehardening process and the nitrided product thereof |
| JPS6431952A (en) * | 1987-07-29 | 1989-02-02 | Daido Steel Co Ltd | Cold tool steel |
| JPH01179853A (en) * | 1988-01-11 | 1989-07-17 | Daikin Ind Ltd | Air conditioner |
| US4966751A (en) * | 1987-06-11 | 1990-10-30 | Aichi Steel Works, Limited | Steel having good wear resistance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE739958C (en) * | 1937-04-30 | 1943-10-08 | Sandvikens Jernverks Ab | Steel alloy for corrosion-resistant, hardened cutting tools produced by rolling or similar processing methods |
| CH585799A5 (en) * | 1971-12-29 | 1977-03-15 | Lenin Kohaszati Muvek | High speed steel based on molybdenum - with good cutting props dependent on vanadium and niobium content |
| US4224060A (en) * | 1977-12-29 | 1980-09-23 | Acos Villares S.A. | Hard alloys |
| JPS60427B2 (en) * | 1979-05-17 | 1985-01-08 | 大同特殊鋼株式会社 | Free-cutting steel with excellent cold forging properties |
| JPH0765141B2 (en) * | 1985-09-18 | 1995-07-12 | 日立金属株式会社 | Tool steel for hot working |
| SE457356C (en) * | 1986-12-30 | 1989-10-31 | Uddeholm Tooling Ab | TOOL STEEL PROVIDED FOR COLD PROCESSING |
-
1989
- 1989-10-23 AT AT2423/89A patent/AT393387B/en not_active IP Right Cessation
-
1990
- 1990-09-13 TW TW079107707A patent/TW199910B/zh active
- 1990-10-12 JP JP2272524A patent/JP2794641B2/en not_active Expired - Lifetime
- 1990-10-12 EP EP90890280A patent/EP0425471B1/en not_active Expired - Lifetime
- 1990-10-12 DK DK90890280.2T patent/DK0425471T3/en not_active Application Discontinuation
- 1990-10-12 DE DE59008009T patent/DE59008009D1/en not_active Expired - Lifetime
- 1990-10-12 ES ES90890280T patent/ES2068379T3/en not_active Expired - Lifetime
- 1990-10-23 KR KR1019900016926A patent/KR0170386B1/en not_active IP Right Cessation
- 1990-10-23 US US07/601,676 patent/US5160553A/en not_active Expired - Lifetime
- 1990-10-23 BR BR909005350A patent/BR9005350A/en not_active IP Right Cessation
- 1990-10-23 AU AU64922/90A patent/AU631690B2/en not_active Ceased
- 1990-10-23 ZA ZA908467A patent/ZA908467B/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4264380A (en) * | 1979-11-16 | 1981-04-28 | General Electric Company | Nitride casehardening process and the nitrided product thereof |
| US4966751A (en) * | 1987-06-11 | 1990-10-30 | Aichi Steel Works, Limited | Steel having good wear resistance |
| JPS6431952A (en) * | 1987-07-29 | 1989-02-02 | Daido Steel Co Ltd | Cold tool steel |
| JPH01179853A (en) * | 1988-01-11 | 1989-07-17 | Daikin Ind Ltd | Air conditioner |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5445685A (en) * | 1993-05-17 | 1995-08-29 | The Regents Of The University Of California | Transformation process for production of ultrahigh carbon steels and new alloys |
| WO1999050469A1 (en) * | 1998-03-27 | 1999-10-07 | Uddeholm Tooling Aktiebolag | Cold work steel |
| CN1098369C (en) * | 1998-03-27 | 2003-01-08 | 尤迪霍尔姆工具公司 | Cold work steel |
| US6461448B1 (en) | 1998-08-12 | 2002-10-08 | Swagelok Company | Low temperature case hardening processes |
| US6272963B1 (en) * | 1999-01-28 | 2001-08-14 | Hitachi Metals, Ltd. | Blade material for metallic band saw and metallic band saw made therefrom |
| US6773482B2 (en) * | 2001-04-11 | 2004-08-10 | Bohler Edelstahl, Gmbh | cold work steel alloy for the manufacture of parts by powder metallurgy |
| US20030068248A1 (en) * | 2001-04-11 | 2003-04-10 | Bohler Edelstahl Gmbh | Cold work steel alloy for the manufacture of parts by powder metallurgy |
| US20030155045A1 (en) * | 2002-02-05 | 2003-08-21 | Williams Peter C. | Lubricated low temperature carburized stainless steel parts |
| US6723182B1 (en) * | 2002-11-14 | 2004-04-20 | Arthur J. Bahmiller | Martensitic alloy steels having intermetallic compounds and precipitates as a substitute for cobalt |
| WO2008066438A1 (en) * | 2006-11-27 | 2008-06-05 | E2 Forestry Hb | Wear resistant tool for wood chipping |
| US20100192476A1 (en) * | 2009-01-14 | 2010-08-05 | Boehler Edelstahl Gmbh & Co Kg | Wear-resistant material |
| US8623108B2 (en) * | 2009-01-14 | 2014-01-07 | Boehler Edelstahl Gmbh & Co Kg | Wear-resistant material |
| CN105526437A (en) * | 2016-02-15 | 2016-04-27 | 海安欣凯富机械科技有限公司 | Metal hose |
Also Published As
| Publication number | Publication date |
|---|---|
| AT393387B (en) | 1991-10-10 |
| TW199910B (en) | 1993-02-11 |
| JP2794641B2 (en) | 1998-09-10 |
| KR910008158A (en) | 1991-05-30 |
| EP0425471B1 (en) | 1994-12-14 |
| DK0425471T3 (en) | 1995-02-20 |
| JPH03197649A (en) | 1991-08-29 |
| ZA908467B (en) | 1991-12-24 |
| DE59008009D1 (en) | 1995-01-26 |
| AU631690B2 (en) | 1992-12-03 |
| ES2068379T3 (en) | 1995-04-16 |
| KR0170386B1 (en) | 1999-02-18 |
| EP0425471A1 (en) | 1991-05-02 |
| AU6492290A (en) | 1991-04-26 |
| ATA242389A (en) | 1991-03-15 |
| BR9005350A (en) | 1991-09-17 |
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